求整数数组中和最大的子数组

struct maxInfo
{
        int start;
        int end;
        int max;
};
bool maxValue(int a[], int n, maxInfo& mi )
{

        if( n < 0 ) { return false;}    
        mi.start = mi.end = 0;
        mi.max = a[0];

        int i;
        int curValue = mi.max;

        for( i = 1; i < n ; i ++)
        {
                if(curValue + a[i] > mi.max)
                {
                        if(curValue < 0 ) {
                                mi.start = mi.end = i;
                                mi.max = a[i];

                                curValue = a[i];
                        } else {
                                mi.end = i;
                                mi.max += a[i];

                                curValue +=a[i];
                        }
                } else {
                        curValue += a[i];
                }
        }

        return true;
}

算法很简单，如下：

 

 

测试代码如下：

#include <iostream>
#include <vector>
#include <iterator>
#include <istream>


using namespace std;

struct maxInfo
{
        int start;
        int end;
        int max;
};

void maxValue(vector<int> a, maxInfo &mi)
{
        mi.start = mi.end = 0;
        mi.max = a[0];

        int i;
        int curValue = mi.max;
        int n = a.size();

        for( i = 1; i < n ; i ++)
        {
                if(curValue + a[i] > mi.max)
                {
                        if(curValue < 0 ) {
                                mi.start = mi.end = i;
                                mi.max = a[i];

                                curValue = a[i];
                        } else {
                                mi.end = i;
                                mi.max += a[i];

                                curValue +=a[i];
                        }
                } else {
                        curValue += a[i];
                }
        }
}

int main()
{
        maxInfo mi;

        cout << "Input the datas : " ;

        istream_iterator<int> begin(cin), end;
        vector<int>  vc(begin, end);

        maxValue(vc, mi);

        cout << "[ " << mi.start << ", " << mi.end << " ]" << endl;
        cout << "Max value is: " << mi.max <<endl;
        cout << "Sub array is : " <<endl;
        copy(vc.begin() + mi.start, vc.begin() + mi.end + 1, ostream_iterator<int> (cout, " "));

        return 0;

}